handlers: permisison check for all pages + retrieve user-specific permissions for pages (if any)

handlers/handlerinvalidaction.cpp

@@ -20,7 +20,12 @@ SOFTWARE.
 */
 #include "handlerinvalidaction.h"
 
-Response HandlerInvalidAction::handle(const Request &r)
+Response HandlerInvalidAction::handleRequest(const Request &r)
 {
 	return errorResponse("Invalid action", "No action defined for this action");
 }
+
+bool HandlerInvalidAction::canAccess(const Permissions &perms)
+{
+	return true;
+}